Reliance Controls MB125 Indoor 50-Amp Meter Box

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Price: $63.21    

Product Feature

• Measures up to 12,500 watts @ 125/250 volts
• For use with any portable generator to monitor the load
• 50-Amp Indoor Wattage Meter
• Made in USA

Product Description

Reliance Controls 50-Amp Indoor Wattage Meter. Measures up to 12,500 watts @ 125/250 volts. For use with any portable generator to monitor the load.

Reliance Controls MB125 Indoor 50-Amp Meter Box Review

The design and dimensions of the Reliance Controls MB125 (50-Amp) and MB75 (30-MB) meter boxes are the same; 4 * combination 1/2" & 3/4" knockouts - both right-left sides (1.25" from bottom to center of KO), bottom (dead center), and top (1.25" from left side to center of KO). My biggest complain is the length of the current transformer (CT) connector wires which are 4 * 12" 20 AWG stranded wires (black-yellow) connected to 2 * CT terminals @ one end and 4 * 1/4" female insulated flag (i.e. right-angle) disconnect crimp terminal connectors @ the other end. Depending on which KO used you will have only ~6-8" of usable wire. I noticed some like to butt their meter box directly to their panel, I think the wires are delicate and I would recommend (& per NEC) using a small raceway such as a box spacer connector (a.k.a. back-to-back connector), off-set nipple connector, etc.. I could not get the flag terminals to fit thru 1/2" box spacer & off-set nipple connectors; I did not test but I think they would fit thru 3/4" connectors.

I wanted extra wire length but I did not want to splice into the CT wires - so I created 4 * male-female flag terminal extension wires. Lowes and Home Depot (HD) do not sell female flag terminals so you will need to order them from Amazon or get the at Radio Shack. The blue flags are 16-14 AWG and the red flags are 22-18 AWG - you will need the flag type cause there is not enough room in the meter box for the straight type. Either the blue or red flags will work and driver to the decisions is the gauge size wire you have - I used 20 AWG solid copper bell wire (red-white) which was $.29 per foot at Lowes; I mapped black-to-red and yellow-to-white wires. Crimping flag terminals is a little tricky - make sure the crimper tool crimps at the tip of the tool (versus having a wire cutter) else you may destroy the terminals. I used a 14 AWG solid copper wire from the meter box's green grounding screw to my panel's ground bar - although using a metal raceway would have been sufficient for grounding the meter box.

The manufacture's instructions are weak and I hope someone can learn from my example.

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